Regular Expressions 101

Regular expression for a validating a string with following rules: at least one lowercase letter at least one upper case letter at least one digit length between 6 and 14...

Full email validation with optional "." "-" "_"

Goal is match example lines which are not comments.

Each line in TEXT represents potential input data. The regex is useless so far as my original using assertions neglected the case where required matches occur between double quotes.

Please help with a regex that will find a pattern like this ✖ or this ∀ or this Π

find all js link on page source

easy Email Detection

This regex remove \n like litteral string not a newline

Optional plus or minus sign. Leading zero required for decimal number less than zero.

phone matcher for following formats (123).234.4567 (123)-234-4567 (617) 495-1797 (617) 495 1797 (617) 4951797...

I'm trying to match a hostname input with the following properties: a-z A-Z 0-9 : - are allowed ; doesnot start or end with - ; "." can be used to separate different labels of the hostname. But gives no match for this regex: ^(a-zA-Z0-9|(?<!-)\.(?![-.]))[a-zA-Z0-9]+)?)$ ...